meet the doctor who's called a medical miracle, eben alexander. as the harvard educated neurosurgeon, dr. eben alexander was defined by science and logic, dismissing all claims of the afterlife but four years ago a rare bacterial meningitis left him in a coma on the brink of death. >> at 4:30 a.m. on monday november 10, 2008, i almost died. i woke up that morning with an extremely intense headache and two or three hours my brain started to shut down and that's when i lost consciousness completely and went into coma. i was gone from this world. i saw something that was nothing short of a miracle. i saw heaven. dr. oz: what he experienced not only spawned his book "proof of heaven," it also redirected his entire belief system. >> i was in a very lovely, bright valley with puffy pink white clouds and was traveling on a